Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/45 |
| Brand | Bently Nevada |
| Product Type | Position Monitor |
| System | 3500 Machinery Protection System |
| Number of Channels | 4 channels, configured in pairs |
| Supported Measurements | Axial position, differential expansion, case expansion, valve position |
| Supported Transducers | Proximity transducers, RPTs, DC LVDTs, AC LVDTs, rotary potentiometers |
| Proximitor/RPT Supply | -24 VDC |
| DC LVDT Supply | +15 VDC |
| AC LVDT Excitation | 2.3 Vrms, 3400 Hz sine wave |
| Rotary Potentiometer Supply | -12.38 VDC |
| Recorder Outputs | +4 to +20 mA, proportional to monitor full-scale |
| Recorder Load | 0 to 600 ohm |
| Alert Time Delay | 1 to 60 seconds, adjustable in 1-second intervals |
| Danger Time Delay | 0.1 seconds or 1 to 60 seconds |
| Operating Temp | -30 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | 95% non-condensing |
| Rack Space | Monitor module: 1 full-height front slot; I/O module: 1 full-height rear slot |
| Monitor Dimensions | 241.3 mm x 24.4 mm x 241.8 mm |
| Monitor Weight | 0.91 kg |
| I/O Module Dimensions | 241.3 mm x 24.4 mm x 99.1 mm |
| I/O Module Weight | 0.20 kg |
| Power Consumption | Approximately 5.6 W to 8.5 W, depending on I/O module type |
Position Measurement and TSI Signal Characteristics
The 3500/45 processes position-related transducer signals in four channels arranged as two configurable channel pairs. Therefore, one pair can monitor axial position while the second pair monitors differential expansion or another supported position function.
For proximity transducer applications, technicians should validate the probe gap voltage before commissioning. A typical Bently Nevada eddy-current probe installation uses a nominal -10 VDC target for gap verification, subject to the specific probe and monitoring configuration.
The module supports differential expansion configurations including standard, dual-ramp, and complementary measurement methods. Consequently, the selected configuration must match the mechanical movement range and transducer arrangement.
The monitor also conditions the input signals and compares measured values against programmable Alert and Danger setpoints. It then provides recorder outputs from +4 to +20 mA for external monitoring or recording equipment.
Frequently Asked Questions (FAQ)
Q: How are the four channels of the 3500/45 configured?
A: The four channels operate as two channel pairs. Each pair supports a configured position measurement function, such as axial position or differential expansion.
Q: Which transducer types can connect to the 3500/45?
A: The module supports proximity transducers, Rotary Position Transducers, DC LVDTs, AC LVDTs, and rotary potentiometers.
Q: Can the 3500/45 be replaced while the rack remains energized?
A: The monitor is designed for hot-swappable installation in a 3500 rack. Field replacement must follow the applicable 3500 rack procedures and electrical safety requirements.
Field Installation Guidelines
- Install the monitor module in the designated full-height front slot of the 3500 rack.
- Install the corresponding I/O module in the designated full-height rear slot.
- Verify the channel-pair configuration before connecting field transducers.
- Confirm transducer excitation requirements before applying field wiring.
- Maintain separation between low-level transducer wiring and high-current power or switching conductors.
- Use appropriate cable shielding and terminate shields according to the site grounding design.
- Verify proximity probe polarity, signal wiring, and gap voltage before enabling machinery protection functions.
- Confirm the configured Alert and Danger setpoints against the approved machinery protection settings.
- Check the recorder output loop wiring and external load before commissioning the +4 to +20 mA output.
- After installation, verify the module status LEDs and perform a functional channel check before placing the protection system into service.
Reviews
There are no reviews yet.